package com.suanming.utils.bazi;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class Lunar {

	private int year;
	private int month;
	private int day;
	//是否闰年
	private boolean leap;
	
	Date baseDate = null;
	
	//农历月
	final static String chineseNumber[] = { "1", "2", "3", "4", "5", "6", "7",
			"8", "9", "10", "11", "12" };
	final static String[] Gan = { "甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬",
			"癸" };
	final static String[] Zhi = { "子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申",
			"酉", "戌", "亥" };
	static SimpleDateFormat chineseDateFormat = new SimpleDateFormat(
			"yyyy-MM-dd");
	final static long[] lunarInfo = new long[] { 0x04bd8, 0x04ae0, 0x0a570,
			0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055d2,
			0x04ae0, 0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0,
			0x0ada2, 0x095b0, 0x14977, 0x04970, 0x0a4b0, 0x0b4b5, 0x06a50,
			0x06d40, 0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970, 0x06566,
			0x0d4a0, 0x0ea50, 0x06e95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0,
			0x1c8d7, 0x0c950, 0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0, 0x1a5b4,
			0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557, 0x06ca0, 0x0b550,
			0x15355, 0x04da0, 0x0a5d0, 0x14573, 0x052d0, 0x0a9a8, 0x0e950,
			0x06aa0, 0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260,
			0x0f263, 0x0d950, 0x05b57, 0x056a0, 0x096d0, 0x04dd5, 0x04ad0,
			0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b5a0, 0x195a6,
			0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40,
			0x0af46, 0x0ab60, 0x09570, 0x04af5, 0x04970, 0x064b0, 0x074a3,
			0x0ea50, 0x06b58, 0x055c0, 0x0ab60, 0x096d5, 0x092e0, 0x0c960,
			0x0d954, 0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0,
			0x092d0, 0x0cab5, 0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9,
			0x04ba0, 0x0a5b0, 0x15176, 0x052b0, 0x0a930, 0x07954, 0x06aa0,
			0x0ad50, 0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0, 0x0d260, 0x0ea65,
			0x0d530, 0x05aa0, 0x076a3, 0x096d0, 0x04bd7, 0x04ad0, 0x0a4d0,
			0x1d0b6, 0x0d250, 0x0d520, 0x0dd45, 0x0b5a0, 0x056d0, 0x055b2,
			0x049b0, 0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0 };
	/**
	 * 六十甲子
	 */
	public static final String[] jiazhi = { 
			"甲子", "乙丑", "丙寅", "丁卯", "戊辰", "己巳",
			"庚午", "辛未", "壬申", "癸酉", "甲戌", "乙亥", 
			"丙子", "丁丑", "戊寅", "己卯", "庚辰", "辛巳", 
			"壬午", "癸未", "甲申", "乙酉", "丙戌", "丁亥", 
			"戊子", "己丑", "庚寅", "辛卯", "壬辰", "癸巳", 
			"甲午", "乙未", "丙申", "丁酉", "戊戌", "己亥", 
			"庚子", "辛丑", "壬寅", "癸卯", "甲辰", "乙巳", 
			"丙午", "丁未", "戊申", "己酉", "庚戌", "辛亥", 
			"壬子", "癸丑", "甲寅", "乙卯", "丙辰", "丁巳", 
			"戊午", "己未", "庚申", "辛酉", "壬戌", "癸亥" 
			};
	private Calendar cal;

	public String getYearGanZhi(int hour) {
		int idx = (year - 1864) % 60;
		// 没有过春节的话那么年还算上一年的
		String y = jiazhi[idx];

		String m = "";
		String d = "";
		String h = "";
		idx = idx % 5;
		int idxm = 0;
		/**
		 * 年上起月 甲己之年丙作首，乙庚之岁戊为头， 丙辛必定寻庚起，丁壬壬位顺行流， 更有戊癸何方觅，甲寅之上好追求。
		 */
		idxm = (idx + 1) * 2;
		if (idxm == 10)
			idxm = 0;
		m = Gan[(idxm + month - 1) % 10] + Zhi[(month + 2 - 1) % 12];

		/*
		 * 求出和1900年1月31日甲辰日相差的天数 甲辰日是第四十天
		 */
		int offset = (int) ((cal.getTime().getTime() - baseDate.getTime()) / 86400000L);
		offset = (offset + 40) % 60;
		d = jiazhi[offset];

		/**
		 * 日上起时 甲己还生甲，乙庚丙作初， 丙辛从戊起，丁壬庚子居， 戊癸何方发，壬子是真途。
		 */

		offset = (offset % 5) * 2;

		h = Gan[(offset + hour - 1) % 10] + Zhi[hour - 1];

		return y + m + d + h;
	}

	public String getShichenFromDay(int offset) {

		return null;
	}

	// ====== 传回农历 y年的总天数

	final private static int yearDays(int y) {
		int i, sum = 348;
		for (i = 0x8000; i > 0x8; i >>= 1) {
			if ((lunarInfo[y - 1900] & i) != 0) {
				sum += 1;
			}
		}
		return (sum + leapDays(y));
	}

	// ====== 传回农历 y年闰月的天数
	final private static int leapDays(int y) {
		if (leapMonth(y) != 0) {
			if ((lunarInfo[y - 1900] & 0x10000) != 0) {
				return 30;
			} else {
				return 29;
			}
		} else {
			return 0;
		}
	}

	// ====== 传回农历 y年闰哪个月 1-12 , 没闰传回 0
	final private static int leapMonth(int y) {
		return (int) (lunarInfo[y - 1900] & 0xf);
	}

	// ====== 传回农历 y年m月的总天数
	final private static int monthDays(int y, int m) {
		if ((lunarInfo[y - 1900] & (0x10000 >> m)) == 0) {
			return 29;
		} else {
			return 30;
		}
	}

	// ====== 传回农历 y年的生肖
	final public String animalsYear() {
		final String[] Animals = new String[] { "鼠", "牛", "虎", "兔", "龙", "蛇",
				"马", "羊", "猴", "鸡", "狗", "猪" };
		return Animals[(year - 4) % 12];
	}

	/**
	 * 传出y年m月d日对应的农历. yearCyl3:农历年与1864的相差数 ? monCyl4:从1900年1月31日以来,闰月数
	 * dayCyl5:与1900年1月31日相差的天数,再加40 ?
	 * 
	 * @param cal
	 * @return
	 */
	public Lunar(Calendar cal) {
		this.cal = cal;
		int yearCyl, monCyl, dayCyl;
		int leapMonth = 0;

		try {
			baseDate = chineseDateFormat.parse("1900-1-31");
		} catch (ParseException e) {
			e.printStackTrace(); // To change body of catch statement use
									// Options | File Templates.

		}

		// 求出和1900年1月31日相差的天数
		int offset = (int) ((cal.getTime().getTime() - baseDate.getTime()) / 86400000L);
		dayCyl = offset + 40;
		monCyl = 14;

		// 用offset减去每农历年的天数
		// 计算当天是农历第几天
		// i最终结果是农历的年份
		// offset是当年的第几天
		int iYear, daysOfYear = 0;
		for (iYear = 1900; iYear < 2050 && offset > 0; iYear++) {
			daysOfYear = yearDays(iYear);
			offset -= daysOfYear;
			monCyl += 12;
		}
		if (offset < 0) {
			offset += daysOfYear;
			iYear--;
			monCyl -= 12;
		}
		// 农历年份
		year = iYear;

		yearCyl = iYear - 1864;
		leapMonth = leapMonth(iYear); // 闰哪个月,1-12

		leap = false;

		// 用当年的天数offset,逐个减去每月（农历）的天数，求出当天是本月的第几天
		int iMonth, daysOfMonth = 0;
		for (iMonth = 1; iMonth < 13 && offset > 0; iMonth++) {
			// 闰月
			if (leapMonth > 0 && iMonth == (leapMonth + 1) && !leap) {
				--iMonth;
				leap = true;
				daysOfMonth = leapDays(year);
			} else {
				daysOfMonth = monthDays(year, iMonth);
			}
			offset -= daysOfMonth;
			// 解除闰月
			if (leap && iMonth == (leapMonth + 1)) {
				leap = false;
			}
			if (!leap) {
				monCyl++;
			}
		}
		// offset为0时，并且刚才计算的月份是闰月，要校正
		if (offset == 0 && leapMonth > 0 && iMonth == leapMonth + 1) {
			if (leap) {
				leap = false;
			} else {
				leap = true;
				--iMonth;
				--monCyl;
			}
		}
		// offset小于0时，也要校正
		if (offset < 0) {
			offset += daysOfMonth;
			--iMonth;
			--monCyl;
		}
		month = iMonth;
		day = offset + 1;
	}

	
	//获取农历日
	public static String getChinaDayString(int day) {
		String chineseTen[] = { "0", "1", "2", "3" };
		int n = day % 10 == 0 ? 9 : day % 10 - 1;
		if (day > 30) {
			return "";
		}
		if (day == 10) {
			return "10";
		} else {
			return chineseTen[day / 10] + chineseNumber[n];
		}
	}

	//返回阴历
	public String chineseDatetoString() {
		return chineseNumber[month - 1] + "," + getChinaDayString(day);
	}
	
	
	public String toString() {
		return getYearStr(year) + "年" + (leap ? "闰" : "")
				+ chineseNumber[month - 1] + "月" + getChinaDayString(day);
	}
	
	
	//获取农历年
	public String getYearStr(int year) {
		String[] chineseword = { "零", "一", "二", "三", "四", "五", "六", "七", "八",
				"九" };
		String ys = "";
		int index = year / 1000;
		ys += chineseword[index];
		year = year % 1000;
		index = year / 100;
		ys += chineseword[index];
		year = year % 100;
		index = year / 10;
		ys += chineseword[index];
		year = year % 10;
		index = year;
		ys += chineseword[index];
		return ys;
	}

	
}